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Finding the Fourth Proportional to 191.88, 264.74 and 121.92

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Solution

The fourth proportional to 191.88, 264.74 and 121.92 is: 168.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.88 : 264.74 = 121.92 : x
  2. Step 2: Convert to fraction form
    191.88/264.74 = 121.92/x
  3. Step 3: Cross multiply
    191.88x = 264.74 × 121.92
  4. Step 4: Simplify right side
    191.88x = 32,276.49
  5. Step 5: Solve for x
    x = 32,276.49/191.88
  6. Step 6: Final answer
    x = 168.21

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.